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255 lines
10 KiB
C#
255 lines
10 KiB
C#
//! \file ArcEME.cs
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//! \date Tue Mar 15 08:13:00 2016
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//! \brief Emon Engine (えもんエンジン) resource archives.
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//
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// Copyright (C) 2016 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Text;
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using GameRes.Compression;
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using GameRes.Utility;
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namespace GameRes.Formats.EmonEngine
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{
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[Export(typeof(ArchiveFormat))]
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public class EmeOpener : ArchiveFormat
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{
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public override string Tag { get { return "EME"; } }
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public override string Description { get { return "Emon Engine resource archive"; } } // 'えもんエンジン'
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public override uint Signature { get { return 0x44455252; } } // 'RREDATA'
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public override bool IsHierarchic { get { return false; } }
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public override bool CanCreate { get { return false; } }
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public override ArcFile TryOpen (ArcView file)
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{
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if (!file.View.AsciiEqual (4, "ATA "))
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return null;
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int count = file.View.ReadInt32 (file.MaxOffset-4);
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if (!IsSaneCount (count))
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return null;
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uint index_size = (uint)count * 0x60;
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var index_offset = file.MaxOffset - 4 - index_size;
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var key = file.View.ReadBytes (index_offset - 40, 40);
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var index = file.View.ReadBytes (index_offset, index_size);
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int current_offset = 0;
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var dir = new List<Entry> (count);
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for (int i = 0; i < count; ++i)
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{
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Decrypt (index, current_offset, 0x60, key);
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var name = Binary.GetCString (index, current_offset, 0x40);
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var entry = FormatCatalog.Instance.Create<EmEntry> (name);
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entry.LzssFrameSize = LittleEndian.ToUInt16 (index, current_offset+0x40);
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entry.LzssInitPos = LittleEndian.ToUInt16 (index, current_offset+0x42);
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if (entry.LzssFrameSize != 0)
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entry.LzssInitPos = (entry.LzssFrameSize - entry.LzssInitPos) % entry.LzssFrameSize;
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entry.SubType = LittleEndian.ToInt32 (index, current_offset+0x48);
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entry.Size = LittleEndian.ToUInt32 (index, current_offset+0x4C);
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entry.UnpackedSize = LittleEndian.ToUInt32 (index, current_offset+0x50);
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entry.Offset = LittleEndian.ToUInt32 (index, current_offset+0x54);
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entry.IsPacked = entry.UnpackedSize != entry.Size;
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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if (3 == entry.SubType)
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entry.Type = "script";
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else if (4 == entry.SubType)
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entry.Type = "image";
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dir.Add (entry);
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current_offset += 0x60;
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}
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return new EmeArchive (file, this, dir, key);
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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var ement = entry as EmEntry;
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var emarc = arc as EmeArchive;
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if (null == ement || null == emarc)
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return base.OpenEntry (arc, entry);
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if (3 == ement.SubType)
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return OpenScript (emarc, ement);
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else if (4 == ement.SubType)
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return OpenImage (emarc, ement);
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else if (5 == ement.SubType && entry.Size > 4)
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return OpenT5 (emarc, ement);
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else
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return base.OpenEntry (arc, entry);
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}
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Stream OpenScript (EmeArchive arc, EmEntry entry)
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{
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var header = arc.File.View.ReadBytes (entry.Offset, 12);
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Decrypt (header, 0, 12, arc.Key);
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if (0 == entry.LzssFrameSize)
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{
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var input = arc.File.CreateStream (entry.Offset+12, entry.Size);
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return new PrefixStream (header, input);
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}
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int unpacked_size = LittleEndian.ToInt32 (header, 4);
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if (0 != unpacked_size)
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{
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uint packed_size = LittleEndian.ToUInt32 (header, 0);
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int part1_size = (int)entry.UnpackedSize - unpacked_size;
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var data = new byte[entry.UnpackedSize];
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using (var input = arc.File.CreateStream (entry.Offset+12+packed_size, entry.Size))
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using (var lzss = new LzssStream (input))
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{
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lzss.Config.FrameSize = entry.LzssFrameSize;
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lzss.Config.FrameInitPos = entry.LzssInitPos;
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lzss.Read (data, 0, part1_size);
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}
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using (var input = arc.File.CreateStream (entry.Offset+12, packed_size))
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using (var lzss = new LzssStream (input))
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{
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lzss.Config.FrameSize = entry.LzssFrameSize;
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lzss.Config.FrameInitPos = entry.LzssInitPos;
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lzss.Read (data, part1_size, unpacked_size);
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}
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return new MemoryStream (data);
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}
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else
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{
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var input = arc.File.CreateStream (entry.Offset+12, entry.Size);
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var lzss = new LzssStream (input);
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lzss.Config.FrameSize = entry.LzssFrameSize;
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lzss.Config.FrameInitPos = entry.LzssInitPos;
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return lzss;
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}
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}
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Stream OpenImage (EmeArchive arc, EmEntry entry)
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{
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var header = new byte[40];
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Encoding.ASCII.GetBytes ("EMBM", 0, 4, header, 0);
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LittleEndian.Pack ((ushort)entry.LzssFrameSize, header, 4);
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LittleEndian.Pack ((ushort)entry.LzssInitPos, header, 6);
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arc.File.View.Read (entry.Offset, header, 8, 32);
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Decrypt (header, 8, 32, arc.Key);
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uint entry_size = entry.Size;
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uint colors = LittleEndian.ToUInt16 (header, 14);
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if (0 != colors && header[0] != 7)
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entry_size += Math.Max (colors, 3u) * 4;
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var input = arc.File.CreateStream (entry.Offset+32, entry_size);
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return new PrefixStream (header, input);
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}
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Stream OpenT5 (EmeArchive arc, EmEntry entry)
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{
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var header = arc.File.View.ReadBytes (entry.Offset, 4);
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Decrypt (header, 0, 4, arc.Key);
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var input = arc.File.CreateStream (entry.Offset+4, entry.Size-4);
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return new PrefixStream (header, input);
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}
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internal static unsafe void Decrypt (byte[] buffer, int offset, int length, byte[] routine)
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{
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if (null == buffer)
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throw new ArgumentNullException ("buffer", "Buffer cannot be null.");
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if (offset < 0)
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throw new ArgumentOutOfRangeException ("offset", "Buffer offset should be non-negative.");
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if (buffer.Length - offset < length)
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throw new ArgumentException ("Buffer offset and length are out of bounds.");
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fixed (byte* data8 = &buffer[offset])
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{
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uint* data32 = (uint*)data8;
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int length32 = length / 4;
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int key_index = routine.Length;
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for (int i = 7; i >= 0; --i)
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{
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key_index -= 4;
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uint key = LittleEndian.ToUInt32 (routine, key_index);
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switch (routine[i])
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{
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case 1:
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for (int j = 0; j < length32; ++j)
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data32[j] ^= key;
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break;
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case 2:
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for (int j = 0; j < length32; ++j)
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{
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uint v = data32[j];
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data32[j] = v ^ key;
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key = v;
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}
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break;
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case 4:
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for (int j = 0; j < length32; ++j)
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data32[j] = ShiftValue (data32[j], key);
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break;
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case 8:
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InitTable (buffer, offset, length, key);
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break;
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}
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}
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}
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}
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static uint ShiftValue (uint val, uint key)
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{
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int shift = 0;
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uint result = 0;
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for (int i = 0; i < 32; ++i)
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{
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shift += (int)key;
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result |= ((val >> i) & 1) << shift;
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}
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return result;
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}
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static void InitTable (byte[] buffer, int offset, int length, uint key)
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{
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var table = new byte[length];
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int x = 0;
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for (int i = 0; i < length; ++i)
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{
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x += (int)key;
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while (x >= length)
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x -= length;
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table[x] = buffer[offset+i];
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}
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Buffer.BlockCopy (table, 0, buffer, offset, length);
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}
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}
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internal class EmEntry : PackedEntry
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{
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public int LzssFrameSize;
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public int LzssInitPos;
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public int SubType;
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}
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internal class EmeArchive : ArcFile
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{
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public readonly byte[] Key;
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public EmeArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, byte[] key)
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: base (arc, impl, dir)
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{
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Key = key;
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}
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}
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}
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